LU85484A1 - ARRANGEMENT IN CUTTING TOOLS OF ALL TYPES - Google Patents

Description

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LdÉE arrangement in all types of cutting tools

The invention relates to an arrangement in cutting tools according to the preamble of the first patent claim.

5 Clogging of the cut-through openings and tearing of waste or production parts out of the cut-through openings can result in e.g. with automatic punching machines to production failures and damage to the cutting tool, which may become unusable. The cause of this high-10 coming from parts and waste pieces are the suction effect at high stroke rates of the punching presses and / or the formation of burrs on the part or waste piece, whereby those are torn from the cutting plate by the punch. Likewise, an adhesive force 15 is generated by oil on the material strip or strip of material, which can hold a part on the stamp, which then tears it out of the cutting plate.

The consequences are unusable parts of the device due to pressure marks and a higher amount of material and labor.

The invention has for its object to provide an arrangement in 20 cutting plates, which prevents the coming up and tearing out of waste or manufacturing parts.

This object is achieved by the invention, which is set out in the marking -________ part of the first claim.

The invention is explained in more detail with reference to a drawing consisting of five figures. In it the IFig. 1 the section through a cutting plate and the associated stamp,

Fig. 2 is a plan view of part of a cutting plate with a round opening, -, j φ », - 2 ~

2a is a plan view of part of a cutting plate with an angular opening,

Fig. 3 shows the section along the line 3-3 through the plate according to Fig. 2, 5 Fig. 4, the partial supervision of a further cutting plate and

5 shows the section along the line 5-5 through the plate of FIG. 4th

Cutting plates for punching presses or presses are equipped with a multitude of perforations and openings of different shapes, depending on the parts to be manufactured. In order to make it easier for the waste parts or manufactured parts to fall out, the cutout openings are conically shaped. The angle A of the taper 15 is generally in the range between 0 and 3 °. For

To prevent parts from being torn out, the breakthrough walls are additionally provided with two opposing bevel cuts 10, 11, 20, 21 per insert breakout. The bevel cuts 10, 11, 20, 21 are arranged at 20 at a certain angle B, preferably at an angle of 15 °, to the punching direction. The length of the individual a cut and the grinding depth in the breakthrough wall depend on the material thickness of the parts to be manufactured or machined. For example, with 25 material thicknesses below 1 mm and with openings, their

Diameters are less than 1 mm, the bevel cuts 10, 11 only up to half the thickness of the cutting plate 12.

In the case of thicker material and larger openings, the bevel cuts 20, 21 are ground in continuously over the entire openings, 30 openings.

J In the case of round RH openings (Fig. 2), the bevel cuts 10, 11 and 20, 21 lie in the same direction as that through the "*" 1 - 3 -

Bevel cut axis 3-3, which prevents parts from being twisted out in a spiral.

In contrast, the bevel cuts 10, 11 in the case of angular openings (FIG. 2a) are introduced in opposite directions.

5 The grinding depth in the breakthrough wall is determined empirically and is different for different material thicknesses of the material to be processed by the cutting plate. Typical values are 0.01 mm grinding depth for a material thickness of 0.3 mm and 0.06 mm for 3 mm.

Ql 10 The bevel cut cuts the device part or waste part larger at these points. The angled section at an angle B initially causes the part to be clamped in the “opening” when the punch 13 is lowered. When the part is immersed in the cutting plate 15 12, the two protruding lugs are then squeezed back.

Due to the taper of the cutting plate, the clamping effect is only at a low height of e.g. 2 mm achieved, which prevents clogging of the cutting plate openings.

20 The advantages of arranging bevel cuts in all

Breakthroughs of cutting plates can be seen in the long service life of the cutting tools, the low number of tool cavities, the continuous passage of the punching machines, since no waste lying on the cutting plate can be eliminated, and 25 in the very high number of strokes of the machines.

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Claims (6)

1. Arrangement in cutting tools of all kinds to prevent tearing up of parts and / or waste pieces when _ lifting the stamp out of the cutting tool, in particular ζβ 5 in cutting tools for automatic punching machines and eccentric presses, characterized in that each opening of a cutting plate (12, 22nd ) is provided with two opposing bevel cuts (10, 11, 20, 21), which are ground into the conical opening walls at 9 10 at a certain angle to the punching direction and at a depth depending on the thickness of the material to be processed. 2. Arrangement in cutting tools according to claim 1, characterized 15 in that the bevel cuts with small breakthroughs of the cutting plate (12) are only carried out up to half the cutting plate thickness. i 3. Arrangement in cutting tools according to claim 1, characterized ^ characterized in that the bevel cuts with large diameters - 120 or edge lengths of the openings are ground over the entire thickness of the cutting plate (22). "4. Arrangement in cutting tools according to claim 1 to 3, j characterized in that the bevel is attached at an angle of 15 ° to the punching direction. / I / · · · 3 * - 5 - 9 - ** '* * * 5. Arrangement in cutting tools according to claim 1 to 4, characterized in that the bevel cuts (10, 11, 20, 21, Fig. 2) at round openings in the same direction to a line 5 connecting the bevel cuts lie. 6. Arrangement in cutting tools according to claim 1 to 4, characterized in that the bevel cuts (10, 11, Fig. 2a) are arranged in opposite directions on angular openings. 'Qi